DE102015204607A1 - Internal combustion engine with intake module - Google Patents

Abstract

The present invention relates to an internal combustion engine (1) with an engine block (2) containing a plurality of cylinders (3) with a cylinder head (6) attached to the engine block (2) and fresh air ducts (7) leading to the cylinders (3) ), and with a suction module (9) which is fastened to the cylinder head (6) and which has a fresh air inlet opening (10) and a plurality of fresh air outlet openings (11) which are fluidically connected to the fresh air channels (7). A simplified assembly results when an alignment device (20) for aligning the suction module (9) relative to the cylinder head (6) when mounting the suction module (9) on the cylinder head (6) is provided.

Description

The present invention relates to an internal combustion engine with the features of the preamble of claim 1. The invention also relates to a suction module for such an internal combustion engine.

A generic internal combustion engine comprises at least one engine block, which contains a plurality of cylinders, and at least one cylinder head, which is attached to the engine block and contains leading to the cylinders fresh air ducts. Furthermore, at least one suction module is provided which is fastened to the cylinder head and which has a fresh air inlet opening and a plurality of fresh air outlet openings which are fluidically connected to the fresh air channels.

Such a suction module can also be referred to as fresh air manifold and can be used both in turbocharged engines and in naturally aspirated engines.

Usually, the suction module has a flange in the area of the fresh air outlet openings, which allows a screw connection to the cylinder head. Depending on the configuration, a comparatively complex screw pattern may be present. To realize the screw connection, therefore, a hole pattern of the cylinder head must be brought into register with a hole pattern of the flange in order to screw fastening screws through the through holes of the flange in the screw holes of the cylinder head can. In particular, in the context of a series assembly and preferably in conjunction with an automated screwing this is a relatively high cost for the proper alignment of the intake module relative to the cylinder head is required. Such alignment is done manually, for example by a fitter.

The present invention is concerned with the problem of providing for an internal combustion engine of the type described above or for an associated intake module an improved embodiment, which is characterized in particular by a simplified assembly of the internal combustion engine.

This problem is solved according to the invention by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea of forming an alignment device on the intake module and on the cylinder head, which causes the intake module to be aligned relative to the cylinder head when mounting the intake module on the cylinder head. The alignment device provided for this purpose is preferably arranged between the intake module and the cylinder head so that it is located on the one hand on a side facing the cylinder head mounting side of the intake module and on the other hand on a side facing the suction module connection side of the cylinder head. When mounting the intake module on the cylinder head, the mounting side of the suction module now comes to rest on the connection side of the cylinder head so that the alignment device provided between intake module and cylinder head can act and effect the desired alignment of the intake module relative to the cylinder head. By integrating such an alignment device into the intake module and the cylinder head, the required alignment relative to the cylinder head inevitably and automatically takes place when the intake module is mounted, so that, for example, the aforementioned hole pattern of the intake module is aligned congruently with the hole pattern of the cylinder head. The assembly of the suction module is thereby simplified and can in particular be better automated.

The alignment provided between suction and cylinder head alignment is provided in addition to fastening means which serve to fasten the suction module on the cylinder head. Such fastening means are, for example, screws for screwing the intake module on the cylinder head, which penetrate through openings provided on the intake module and penetrate into screw openings of the cylinder head. The alignment between the intake module and the cylinder head effected with the aid of the alignment device takes place before the suction module is fastened to the cylinder head, that is to say in particular before the abovementioned screw connection. Further, the alignment takes place in an alignment plane which is oriented substantially perpendicular to the mounting direction and which is substantially parallel to the aforementioned mounting side of the suction module and parallel to the aforementioned connection side of the cylinder head, which bear against each other in the mounted state.

According to an advantageous embodiment, the alignment device may comprise at least three separate and spaced apart alignment units, wherein at least one such alignment unit causes an orientation of the suction module to the cylinder head with respect to a first alignment direction, which is oriented perpendicular to a mounting direction in which the intake module attached to the cylinder head is. Furthermore, at least one other such alignment unit causes an orientation of the suction module to the cylinder head with respect to a second alignment direction, which is oriented perpendicular to the mounting direction and inclined to the first alignment direction. By the two perpendicular to the alignment and inclined to each other extending alignment becomes an alignment plane defined, which extends perpendicular to the cultivation direction. Suitably, the two alignment directions are oriented substantially perpendicular to each other, so that the present between the two alignment directions angle 90 ° ± 5 °.

According to an advantageous embodiment, it can be provided that all alignment units bring about an alignment of the suction module to the cylinder head exclusively either in the first alignment direction or in the second alignment direction, so that only these two alignment directions are defined by means of the alignment units. As a result, a particularly simple and efficient positioning or alignment between the intake module and the cylinder head is achieved.

Particularly advantageous is an embodiment in which exactly three alignment units are provided, wherein two of these alignment units, ie a first alignment unit and a second alignment cause an alignment in one alignment direction, while one of these alignment, ie the third alignment unit alignment in the other alignment causes. For example, the first and second alignment units each cause alignment in the first alignment direction, while the third alignment unit effects alignment in the second alignment direction, or vice versa.

According to a particularly advantageous refinement, provision can be made for the two alignment units assigned to an alignment direction, that is to say the first and second alignment units, to be spaced apart from one another in the other alignment direction. Additionally or alternatively, it may be provided that the alignment unit assigned to one of the other alignment directions, that is to say the third alignment unit, is arranged between the two alignment units assigned to an alignment direction, ie between the first and the second alignment unit. Furthermore, it may additionally or alternatively be provided that the alignment unit (third alignment unit) assigned to one of the other alignment directions is arranged offset in one alignment direction relative to the two alignment units (first and second alignment unit) assigned to an alignment direction. The abovementioned measures can be implemented individually or jointly or in any desired combination and in each case bring about an improved alignment of the intake module with respect to the cylinder head. In addition, it can be provided that one alignment unit, which is assigned to the other alignment direction, that is to say the third alignment unit, is arranged substantially centrally between the first and the third alignment unit, that is to say between the two other alignment units, which are assigned to one alignment direction. This central orientation refers to a longitudinal direction of the intake module or the cylinder head and corresponds to the direction in which the cylinders of the cylinder head are arranged side by side. The alignment direction associated with the centrally located (third) alignment unit preferably extends parallel to the aforementioned longitudinal direction.

According to another advantageous embodiment, the alignment units may each have a first alignment element fixedly arranged on the suction module and a second alignment element fixedly arranged on the cylinder head, which interact for aligning the suction module relative to the cylinder head in the respective alignment direction. An embodiment in which the first alignment elements are integrally formed on the suction module is preferred. Additionally or alternatively, the second alignment elements may be formed integrally on the cylinder head.

According to a further development, the first alignment element can be formed by an alignment pin projecting from the suction module at least in an alignment unit, while the associated second alignment element is formed by an alignment opening formed in the cylinder head into which the alignment pin engages for aligning the suction module with the cylinder head. Additionally or alternatively, it can be provided that, at least in one alignment unit, the second alignment element is formed by an alignment pin projecting from the cylinder head, while the associated first alignment element is formed by an alignment opening formed in the suction module into which the alignment pin for aligning the suction module Cylinder head engages. The associated alignment elements of the respective alignment unit thus cooperate by a positive engagement and thereby cause an efficient alignment of the suction module relative to the cylinder head.

In principle, it can be provided that in all alignment units, the first alignment element is formed by an alignment pin. Alternatively it can be provided that in all alignment units, the first alignment element is formed by an alignment opening. In principle, however, a mixed embodiment is also conceivable, so that at least one alignment pin and at least one alignment opening are provided on the suction module. However, an embodiment in which all alignment pins are provided on the suction module is preferred, an integral shaping of the alignment pins on the suction module being preferred here.

According to an advantageous development, at least one such alignment opening can be configured as an elongated hole whose longitudinal direction is perpendicular to the respective alignment direction of the associated alignment unit runs. Preferably, all alignment openings are designed as a slot.

Furthermore, it may be provided that at least one such alignment opening is elongated or configured as an elongated hole and has between its longitudinal ends a guide section which has two mutually opposite wall sections which extend parallel to one another and perpendicular to the respective alignment direction of the associated alignment unit. Appropriately, then the associated alignment pin, which engages in this elongated alignment opening, be guided on said wall sections. The alignment pin, for example, have a circular cross-section transverse to the mounting direction. However, this is not mandatory.

Preferably, all alignment openings are elongated or designed as a slot.

According to another advantageous development, at least one such alignment opening can have a circular cross-section perpendicular to the mounting direction. Also preferred here is an embodiment in which all alignment openings have such a circular cross-section. However, it is also conceivable to use a mixed embodiment in which at least one alignment opening has such a circular cross-section, while at least one other alignment opening is elongate or designed as a slot.

If, in the respective alignment unit, the alignment opening has a circular cross-section, according to an advantageous embodiment, the associated alignment pin perpendicular to the mounting direction have a pin cross-section which has parallel to the alignment of the associated alignment unit a pin width which is greater than a parallel to the other alignment direction extending pin thickness , Suitably, the pin width extends perpendicular to the pin thickness. Since the pin cross-sections have a larger pin width than pin thickness, the respective alignment pin within the circular alignment opening defines the associated alignment direction, since a greater clearance for the alignment pin is parallel to the pin thickness within the alignment, so that the alignment is parallel to the pen width.

Particularly useful is a development in which the pin cross-section is flat, so that along the pin width between end portions which are spaced apart in a pin width direction, there is a section with a constant pin thickness.

Additionally or alternatively, in the event that the respective alignment unit has an alignment opening with a circular cross-section, the associated alignment pin be designed so that it perpendicular to the respective alignment direction of the associated alignment unit has a lower bending stiffness than parallel to this alignment direction. Thus, when aligning the suction module relative to the cylinder head, a bending deformation, preferably an elastic bending deformation, of the alignment pin take place, whereby an alignment between the intake module and the cylinder head takes place parallel to the greater bending stiffness.

If the pin cross-section is flat, the smaller bending stiffness results perpendicular to the relatively small pin thickness, while perpendicular to the relatively large pin width there is a correspondingly higher flexural rigidity. In particular, it can then be provided that the pin width substantially corresponds to the diameter of the circular alignment opening, whereby the alignment is parallel to the pin width, while transversely thereto, ie in the pin thickness, still a certain mobility of the alignment pin is present within the alignment, namely in particular by the lower bending stiffness in this direction.

According to an advantageous embodiment, all alignment units can lie in an alignment plane in which the suction module bears against the cylinder head. This simplifies the alignment between the intake module and the cylinder head.

An intake module according to the invention, which is suitable for an internal combustion engine of the type described above, has a plurality of first alignment elements arranged fixedly on a mounting side provided for mounting the intake module on the cylinder head. Additionally or alternatively, the suction module can have a module housing, on which a plurality of first alignment elements are integrally formed on a mounting side provided for mounting the suction module on the cylinder head. The first alignment elements provided on the suction module or on the module housing may, as explained above, preferably be alignment pins and / or alignment openings.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Show, in each case schematically,

1 a greatly simplified schematic diagram of an internal combustion engine,

2 a side view of a suction module,

3 a bottom view of the suction module,

4 a simplified sectional view of the internal combustion engine in the region of an alignment device analogous to a in 3 indicated, angled section line IV-IV,

5 a greatly simplified schematic diagram of the alignment device,

6 a view like in 5 but in another embodiment.

Corresponding 1 includes an internal combustion engine 1 at least one engine block 2 in which several cylinders 3 are arranged, of which in 1 however, only one is indicated by a broken line. In 1 closes below the engine block 2 a crankcase 4 on, at the bottom of an oil pan 5 is arranged. At the top of the engine block 2 closes a cylinder head 6 on to the cylinders 3 leading fresh air ducts 7 contains, of which in 1 only one recognizable and indicated by a broken line. Furthermore, the cylinder head contains 6 for the cylinders 3 exhaust ducts 8th of which in 1 also only one recognizable and indicated by a broken line. Other usually in an internal combustion engine 1 existing components, such as crankshaft, piston, connecting rods, gas exchange valves and valve control and injector are not shown for clarity. Furthermore, in the example of the 1 the internal combustion engine 1 designed as a series engine, the only one engine block 2 and only one cylinder head 6 having. In principle, designs are also conceivable in which at least two engine blocks 2 and / or at least two cylinder heads 6 available. For example, in an engine designed as a V-engine 1 two cylinder heads 6 be provided, and in an engine designed as a boxer engine 1 can also have two engine blocks 2 be provided.

The internal combustion engine 1 also has at least one suction module 9 on, in a suitable manner on the cylinder head 6 is attached and that a fresh air inlet opening 10 as well as several with the fresh air channels 7 fluidly connected fresh air outlet openings 11 having. The suction module 9 forms part of a fresh air system 12 for the supply of cylinders 3 serving with fresh air. The suction module 9 serves as a fresh air manifold, which transfers the fresh air to the individual cylinders 3 distributed. Furthermore, the internal combustion engine 1 with an exhaust system 13 equipped with an exhaust manifold 14 having. The exhaust manifold 14 is on the cylinder head 6 attached and has several exhaust gas inlet openings 15 that with the exhaust ducts 8th are fluidly connected, and an exhaust outlet 16 , In the example shown, the internal combustion engine 1 as a supercharged internal combustion engine 1 designed and provided for this purpose with a charging device, here as an exhaust gas turbocharger 17 is designed. The turbocharger 17 owns a turbine 18 in the exhaust system 13 is integrated, as well as a compressor 19 in the fresh air plant 12 is involved. In operation of the internal combustion engine 1 drives the turbine 18 in the usual way the compressor 19 at.

In the presented here internal combustion engine 1 is between the suction module 9 and the cylinder head 6 an alignment device 20 provided in 1 indicated by a broken line. It serves to align the suction module 9 relative to the cylinder head 6 when mounting the suction module 9 to the cylinder head 6 , This alignment device 20 is in addition to fasteners not shown here in detail provided for attaching the suction module 9 on the cylinder head 6 serve. Of these fasteners are in the view of 3 Through openings 21 recognizable, the suction module 9 are formed and passed through the fastening screws, not shown here, to the suction module 9 with the cylinder head 6 to screw.

The alignment device 20 according to the 2 to 6 at least three separate alignment units 22 on, which are arranged spaced from each other. According to the 5 and 6 which is a schematization of the alignment device 20 are two such alignment units 22 designed to provide an orientation of the suction module 9 opposite the cylinder head 6 with respect to a first alignment direction 23 cause in the 5 and 6 runs vertically. The first alignment direction 23 is also perpendicular to a cultivation direction 24 oriented in the 1 . 2 and 4 is indicated by a vertical arrow and in the suction module 9 to the cylinder head 6 is grown. These two alignment units 22 are in the 2 . 3 . 5 and 6 arranged left and right and can also be referred to as the first or left or second or right alignment 22 be designated.

The remaining other alignment unit 22 On the other hand, it is designed so that it aligns the suction module 9 relative to the cylinder head 6 with respect to a second alignment direction 25 causes, which are also perpendicular to the cultivation direction 24 and also inclined to the first alignment direction 23 is oriented. In the example, this second alignment direction 25 substantially perpendicular to the first alignment direction 23 oriented and runs accordingly in the 5 and 6 horizontal. The first alignment direction 23 and the second alignment direction 25 define an alignment plane 26 , in the 4 is indicated and the substantially perpendicular to the cultivation direction 24 runs. This other alignment unit 22 is in the 2 . 3 . 5 and 6 arranged centrally and can also be referred to below as the third or middle alignment unit 22 be designated.

In the preferred examples shown here, there are exactly three such alignment units 22 provided, all either an orientation in the first alignment 23 or in the second alignment direction 25 cause. The variant shown here is preferred, in which two alignment units 22 namely, the first and second alignment units 22 one orientation in the first alignment direction 23 effect while only one alignment unit 22 namely, the third alignment unit 22 an orientation in the second alignment direction 25 causes. The two of the first alignment 23 associated first and second alignment unit 22 are doing in the second alignment 25 spaced apart. Further, the second alignment direction 25 associated third or middle alignment unit 22 with respect to the second alignment direction 25 between the two of the first alignment 23 associated left and right alignment unit 22 arranged. In addition, the second alignment direction 25 associated third alignment unit 22 in the first alignment direction 23 to the two of the first alignment 23 associated first and second alignment unit 22 staggered. Furthermore, it is provided here that the second alignment direction 25 associated third alignment unit 22 with respect to a longitudinal direction 27 of the suction module 9 centered between the two of the first alignment 23 associated first and second alignment unit 22 is arranged. The longitudinal direction 27 of the suction module 9 is in the 2 . 3 . 5 and 6 each indicated by a double arrow and extends parallel to a direction in which the individual cylinders 3 of the engine block 2 next to each other in the engine block 2 are arranged. This longitudinal direction 27 runs in 1 perpendicular to the plane of the drawing. The second alignment direction 25 runs parallel to the longitudinal direction 27 of the suction module 9 ,

The individual alignment units 22 each have one on the suction module 9 fixed first alignment element 28 and one on the cylinder head 6 fixed second alignment element 29 on. One of the two alignment elements 28 . 29 is in the examples shown here as Ausrichtstift 30 configured, while the respective other alignment element 28 . 29 here as an alignment opening 31 is designed, in which the associated alignment pin 30 for aligning the suction module 9 to the cylinder head 6 intervenes. In the case of the preferred embodiments shown here, that is in each case at the intake module 9 trained first alignment element 28 through such an alignment pin 30 formed while on the cylinder head 6 trained second alignment element 29 each through such an alignment opening 31 is formed.

At the in 5 embodiment shown is the respective alignment opening 31 elongated or through a slot 32 educated. The longitudinal direction of the respective slot 32 extends perpendicular to the alignment 23 . 25 , that of the respective alignment unit 22 assigned. Furthermore, has the elongated alignment opening 31 between its longitudinal ends a guide section 33 which is defined by two mutually opposite, mutually parallel wall sections. These wall sections extend perpendicular to the alignment 23 . 25 , that of the respective alignment unit 22 assigned. Thus, the guide section defines 33 the alignment direction 23 . 25 the respective alignment unit 22 , The associated alignment pin 30 is now in the said leadership section 33 guided on the said wall sections, such that the respective alignment pin 30 in the respective elongated alignment opening 31 with respect to the alignment direction 23 . 25 , this alignment unit 22 is assigned, in the alignment opening 31 is centered while he is perpendicular to it, so in the other direction of alignment 23 . 25 , inside the elongated alignment opening 31 is mobile. In particular, that of the elongate alignment openings 31 associated alignment pin 30 as in the example of 5 perpendicular to the mounting direction 24 have a circular cross-section.

In 6 another embodiment is explained in more detail, which also in the example of 2 to 4 is realized. This embodiment is characterized by a particularly inexpensive manufacturability. It is characterized by the fact that the alignment openings 31 perpendicular to the mounting direction 24 each have a circular cross-section. The associated alignment pins 30 are designed so that they are perpendicular to the alignment 23 . 25 , that of the respective alignment unit 22 is associated, have a lower bending stiffness than parallel to this alignment direction 23 . 25 , that of the respective alignment unit 22 assigned. For example, in the case of 6 left first alignment unit shown 22 the first alignment direction 23 intended. The associated alignment pin 30 is then in the second alignment direction 25 equipped with a smaller bending stiffness than in the first alignment direction 23 , The same applies to the in 6 right second alignment unit shown 22 , Reverse conditions, however, result in the 6 centrally shown third alignment unit 22 ,

Directional bending stiffnesses are achieved here by the associated alignment pin 30 perpendicular to the mounting direction 24 has a pin cross-section, which is parallel to the alignment 23 . 25 , the associated alignment unit 22 is assigned, a pen width 34 which is larger than a pin thickness 35 parallel to the other alignment direction 23 . 25 runs. Specifically, at the in 6 shown example in the first alignment unit shown on the left 22 the pen width 34 parallel to the first alignment direction 23 oriented and significantly larger dimensions than the associated pin thickness 35 parallel to the second alignment direction 25 is oriented. The same applies to the in 6 right second alignment unit shown 22 , In contrast, at the in 6 centrally shown third alignment unit 22 the orientations of pen width 34 and pin thickness 35 vice versa.

In the preferred example, the respective pin cross section is flat, such that the pin cross section is along the pin width 34 between unspecified end portions which are spaced from each other in the pin width direction, a portion 36 in which the pin thickness 35 is constant.

Appropriately, for example, according to 4 while all alignment units 22 in the aforementioned alignment plane 26 , in the assembled state, a the cylinder head 6 facing mounting side 38 of the suction module 9 at a suction module 9 facing connection side 39 of the cylinder head 6 is applied.

The suction module 9 has expediently a module housing 37 at which the air inlet opening 10 and the air outlet openings 11 are formed. Also is the mounting side 38 on this module housing 37 , Furthermore, the through holes are also 21 the fastening means not shown in detail on the module housing 37 educated.

Claims (15)

Internal combustion engine - with at least one engine block ( 2 ), which has several cylinders ( 3 ), - with at least one cylinder head ( 6 ) on the engine block ( 2 ) and to the cylinders ( 3 ) leading fresh air ducts ( 7 ), - with at least one suction module ( 9 ) on the cylinder head ( 6 ) is attached and that a fresh air inlet opening ( 10 ) as well as several, with the fresh air channels ( 7 ) fluidly connected fresh air outlet openings ( 11 ), characterized in that an alignment device ( 20 ) for aligning the suction module ( 9 ) relative to the cylinder head ( 6 ) when mounting the suction module ( 9 ) on the cylinder head ( 6 ) is provided. Internal combustion engine according to claim 1, characterized in that - the alignment device ( 20 ) at least three separate and spaced apart alignment units ( 22 ), - that at least one such alignment unit ( 22 ) an orientation of the suction module ( 9 ) to the cylinder head ( 6 ) with respect to a first alignment direction ( 23 ) perpendicular to a mounting direction ( 24 ), in which the suction module ( 9 ) to the cylinder head ( 6 ) - at least one other such alignment unit ( 22 ) an orientation of the suction module ( 9 ) to the cylinder head ( 6 ) with respect to a second alignment direction ( 25 ), which is perpendicular to the mounting direction ( 24 ) and inclined to the first alignment direction ( 23 ) is oriented. Internal combustion engine according to claim 2, characterized in that the first alignment direction ( 23 ) substantially perpendicular to the second alignment direction ( 25 ) is oriented. Internal combustion engine according to claim 2 or 3, characterized in that each alignment unit ( 22 ) an orientation of the suction module ( 9 ) to the cylinder head ( 6 ) exclusively either in the first alignment direction ( 23 ) or in the second alignment direction ( 25 ) causes. Internal combustion engine according to one of claims 2 to 4, characterized in that - exactly three alignment units ( 22 ) are provided, - that two of these three alignment units ( 22 ) an alignment in one alignment direction ( 23 . 25 ), that one of these three alignment units ( 22 ) an alignment in the other alignment direction ( 23 . 25 ) causes. Internal combustion engine according to claim 5, characterized in that - the two of the one orientation ( 23 . 25 ) associated alignment units ( 22 ) in the other alignment direction ( 23 . 25 ) are spaced from each other, - that one of the other alignments ( 23 . 25 ) associated alignment unit ( 22 ) with respect to this alignment direction ( 23 . 25 ) between the two of the one orientation ( 23 . 25 ) associated alignment units ( 22 ), that - one of the other alignment direction ( 23 . 25 ) associated alignment unit ( 22 ) in one alignment direction ( 23 . 25 ) offset to the two of the one orientation ( 23 . 25 ) associated alignment units ( 22 ) is arranged. Internal combustion engine according to one of claims 2 to 6, characterized in that the alignment units ( 22 ) each one on the suction module ( 9 ) fixed first alignment element ( 28 ) and one on the cylinder head ( 6 ) fixed second alignment element ( 29 ) for aligning in the respective alignment direction ( 23 . 25 ) interact. Internal combustion engine according to claim 7, characterized in that - at least in such an alignment unit ( 22 ) the first alignment element ( 28 ) by a in the cultivation direction ( 24 ) from the suction module ( 9 ) projecting alignment pin ( 30 ) is formed, while the associated second alignment element ( 29 ) by a in the cylinder head ( 6 ) formed alignment opening ( 31 ) into which the alignment pin ( 30 ) for aligning the suction module ( 9 ) to the cylinder head ( 6 ), and / or - that at least in such an alignment unit ( 22 ) the second alignment element ( 29 ) by a in the cultivation direction ( 24 ) from the cylinder head ( 6 ) projecting alignment pin ( 30 ) is formed, while the associated first alignment element ( 28 ) by one in the suction module ( 9 ) formed alignment opening ( 31 ) into which the alignment pin ( 30 ) for aligning the suction module ( 9 ) to the cylinder head ( 6 ) intervenes. Internal combustion engine according to claim 8, characterized in that at least one such alignment opening ( 31 ) as a slot ( 32 ) is configured, the longitudinal direction perpendicular to the respective alignment direction ( 23 . 25 ) of the associated alignment unit ( 22 ) runs. Internal combustion engine according to claim 8 or 9, characterized in that at least one such alignment opening ( 31 ) is elongated and between its longitudinal ends a guide section ( 33 ), which has two mutually opposite wall sections, which are parallel to each other and perpendicular to the respective alignment ( 23 . 25 ) of the associated alignment unit ( 22 ). Internal combustion engine according to one of claims 8 to 10, characterized in that - at least one such alignment opening ( 31 ) perpendicular to the mounting direction ( 24 ) has a circular cross-section, - that the associated alignment pin ( 30 ) perpendicular to the mounting direction ( 24 ) has a pin cross-section which is parallel to the alignment ( 23 . 25 ) of the associated alignment unit ( 22 ) a pen width ( 34 ) which is greater than one parallel to the other alignment direction ( 23 . 25 ) pen thickness ( 35 ). Internal combustion engine according to claim 11, characterized in that the pin cross section is flat and along the pin width ( 34 ) between end portions which are spaced apart in a pin width direction, a portion (FIG. 36 ) with constant pin thickness ( 35 ) having. Internal combustion engine according to one of claims 8 to 12, characterized in that - at least one such alignment opening ( 31 ) perpendicular to the mounting direction ( 24 ) has a circular cross-section, - that the respective alignment pin ( 30 ) perpendicular to the respective alignment direction ( 23 . 25 ) of the associated alignment unit ( 22 ) has a smaller bending stiffness than parallel to this alignment direction ( 23 . 25 ). Internal combustion engine according to one of claims 2 to 13, characterized in that all alignment units ( 22 ) in an alignment plane ( 26 ), in which the suction module ( 9 ) on the cylinder head ( 6 ) is present. Suction module for an internal combustion engine ( 1 ) at least according to claim 7, characterized in that - the suction module ( 9 ) at a for mounting the suction module ( 9 ) to the cylinder head ( 6 ) provided mounting side a plurality of fixed thereto first alignment elements ( 30 ), and / or - that the suction module ( 9 ) a module housing ( 37 ), on which at a for mounting the suction module ( 9 ) on the cylinder head ( 6 ) mounted side ( 38 ) a plurality of first alignment elements ( 28 ) are formed integrally.

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